Publication Order of Boundary Books

4 Books By Ryk E. Spoor

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Complete Reading Order

4 Books

1

Boundary
2006

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2

Threshold
1996

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3

Skyspark
2013

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4

Portal
2026

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Characters

1 Character

Boundary Boundary is a series of science fiction/adventure novels by Eric Flint and Ryk E. Spoor. When paleontologist Dr. Helen Sutter gets hold of a fossil that a teenager found in the desert in Arizona, she thinks it can help her solve some of Earth’s greatest mysteries. But what she doesn’t expect is that this fossil will send her all the way to Mars.